[MI 019-120] I/A Series Mass Flowtubes Models CFS20 ... - Invensys

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MI 019-120 – June 20114. Startup26
5. TroubleshootingRTD Res Low or RTD Res HighThe problem of RTD resistance being too low or too high can be caused by a wiring problem;either in the transmitter Resistance Temperature Detector (RTD) drive current circuits or the4-wire IEC Pt 100 RTD in the flowtube. Perform the following tests to locate the problem.1. Disconnect flowtube connection terminations 1 through 4 at the transmitter. Usingan ohmmeter, confirm that continuity (a short circuit) exists between the flowtubewires normally connected to terminals 1 and 3 and then 2 and 42. Using an ohmmeter, confirm that approximately 110 at 25 C (77 F) existsbetween the flowtube wires normally connected to terminals 1 (or 3) and 2 (or 4).The resistance is dependent on flowtube temperature at time of measurement.Nominal resistance is 100 at 0 C (32 F). See Figure 17.3. Place 110 resistor across transmitter terminals 3 and 4. Voltage measured across theresistor should be 44 mV. If voltage reading is not correct, contact Invensys.Transmitter replacement may be required.100 OHMS AT 0 °C (32 °F)110 OHMS AT 25 °C (77 °F)1 3 2 4Figure 17. Resistance between Flowtube WiresConnected to Transmitter Terminals 1, 2, 3, and 427
Page 1 and 2: InstructionMI 019-120June 2011I/A S
Page 3 and 4: ContentsFigures....................
Page 5 and 6: Figures1 Data Plate Location and Fl
Page 7 and 8: Tables1 Reference Documents .......
Page 9 and 10: 1. IntroductionGeneral DescriptionT
Page 11 and 12: 1. Introduction MI 019-120 - June 2
Page 19 and 20: 2. InstallationFlowtube Identificat
Page 21 and 22: 2. Installation MI 019-120 - June 2
Page 27 and 28: 3. WiringThe installation and wirin
Page 29 and 30: 3. Wiring MI 019-120 - June 2011Jun
Page 31 and 32: 3. Wiring MI 019-120 - June 20114.
Page 33: 4. StartupSizing Your Flowtube and
Page 37 and 38: 6. MaintenanceSanitary End Connecti
Page 39 and 40: IndexCCoil Resistances 5EElectrical

[MI 019-120] I/A Series Mass Flowtubes Models CFS20 ... - Invensys

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